Thorium-android-app/app/src/main/res/layout/activity_video_play.xml

<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:keepScreenOn="true"
    tools:context="net.schueller.peertube.activity.VideoPlayActivity">

    <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"

        android:layout_width="match_parent"
        android:layout_height="match_parent">


        <com.google.android.exoplayer2.ui.PlayerView
            android:id="@+id/video_view"
            android:layout_width="match_parent"
            android:layout_height="250dp"
            android:background="@color/black"

            app:layout_constraintDimensionRatio="H,3:1"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toTopOf="parent" />

        <ProgressBar
            android:id="@+id/progress"
            style="?android:attr/progressBarStyleHorizontal"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_below="@id/video_view"
            android:background="@color/black"
            android:indeterminate="false"
            android:max="100" />

        <android.support.v7.widget.LinearLayoutCompat
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:layout_below="@id/progress"
            android:padding="16dp"
            android:orientation="vertical">

            <TextView
                android:id="@+id/name"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:textAppearance="@style/Base.TextAppearance.AppCompat.Title" />

            <TextView
                android:id="@+id/videoMeta"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:textAppearance="@style/Base.TextAppearance.AppCompat.Caption" />

            <TextView
                android:id="@+id/description"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:textAppearance="@style/Base.TextAppearance.AppCompat.Body1" />

        </android.support.v7.widget.LinearLayoutCompat>


    </RelativeLayout>

</android.support.design.widget.CoordinatorLayout>